Today is sizdah-bedar, a kind of traditional festival in Iran, celebrated on the thirteenth day of the new year. The Iranian new year, called Nowruz, begins on the first day of spring. The first month of the year is called Farvardin.
On the thirteenth of Farvardin, Iranians often spend the day outdoors in a ceremony called sizdah-bedar (sizdah meaning 13 and bedar meaning rid of). This day, the thirteenth, marks the end of Nowruz celebrations and the return to ordinary life. It is customary for families to go to a park or to the countryside for a picnic on this day and throw out the sabzeh from the Nowruz haftseen: https://afarinrava.blogspot.com/2022/03/haftseen.html
Symbolically, the sabzeh, which is wheat, barley, or lentil sprouts, has supposedly collected all the hardship, sickness, and bad fate, and on this thirteenth day, families get rid of it on the thirteenth day of the year in a happy event.
